Hello,
This drachm is sassanid, not an imitation of another entity

3rd crown of Khusru II, so this page :
https://en.numista.com/catalogue/pieces33699.html
BBA mintmark, so the court mint (Dastagird, in Irak during this rule).
The regnal year is not easy to see on this one but I read 26 however I'm not completely sure about the "wyst" (twenty).